For antenna applications, such as Fresnel-zone plate antennas (FZPA), the low focusing efficiency deprecates the radiation efficiency, making them less competitive than other conventional antennas. The main drawback of FZPL for microwave applications is a low efficiency in transmission compared to conventional lenses, due to high reflections from opaque zones.
At microwaves these lenses present interesting characteristics such as low profile, low cost and ease of fabrication. Ultimately, the same concept has been successfully applied throughout the whole electromagnetic spectrum and in particular in the microwave range for lens antennas 2, 3, 4. In his seminal paper, written more than a century ago, Soret devised this lens as a purely optical device. The Soret lens is a member of the Fresnel-zone plate lens (FZPL) family consisting of alternating transparent and opaque concentric rings 1. The focal properties of the lens along with its radiation characteristics in a lens antenna configuration have been studied numerically and confirmed experimentally, showing a gain improvement of ~2 dB with respect to a fishnet Soret lens without the fishnet metamaterial. It is designed for the W-band of the millimeter-waves range with a subwavelength focal length FL = 1.58 mm (0.5λ 0) aiming at a compact antenna or radar systems. The hybrid Soret fishnet metalens retains all the merits of classical Soret lenses such as low profile, low cost and ease of manufacturing. The building block of this advanced Soret lens is the fishnet metamaterial operating in the near-zero refractive index regime with one of the edge layers designed with alternating opaque and transparent concentric rings made of subwavelength holes. Here we demonstrate that simplicity is not at odds with performance and we show how the fishnet metamaterial can improve the radiation pattern of a Soret lens.
This is usually tackled by implementing unattractive cumbersome designs. Unfortunately, they also present larger Fresnel reflection loss than conventional lenses.
SMART ANTENNA WITH CST MICROWAVE STUDIO PATCH
In this thesis ANN and ANFIS analysis techniques are mainly focused to analysis and design of novel and complex microstrip patch antennas.At the expense of frequency narrowing, binary amplitude-only diffractive optical elements emulate refractive lenses without the need of large profiles. All these restrictions have forced to develop an efficient optimizing soft computing tool for accurate and competent antenna design.
SMART ANTENNA WITH CST MICROWAVE STUDIO SOFTWARE
This simulation software perform results with trial and error basis. are commonly used for analysis of complex type of antenna and other microwave design structure. Nowadays most powerful simulation software such as IE3D, HFSS and CST microwave studio etc. But these techniques, involves rigorous mathematical formulation with extensive numerical procedure thus, more time consuming. Consequently some other powerful techniques such as method of moment and finite difference time domain method were used. Although the complicated shapes of antennas cannot be analyzed with these traditional techniques. In past decades in the designing of traditional microstrip antenna the analysis techniques such as cavity model and transmission line model were generally used. Thus, there is an emergent demand on use of Computer Aided Design CAD model for antenna design engineers.
Hence, the physical dimensions and substrate material have to be precisely predicted and for impedance matching, the feed location has to be appropriately chosen. So that for a particular application patch should be analyses accurately. Major of which is their narrow bandwidth and low gain. However, they have some short comings too. They have many more advantages like low cost, low profile, light weight, ease of fabrication and compatible with monolithic microwave integrated circuit design etc. Newline In the challenging scenario of wireless communication, everywhere the demands of microstrip patch antenna have become a major research topic. Please use this identifier to cite or link to this item:Īdaptive Neuro Fuzzy Inference System For Analysis And Design Of Microstrip AntennaĪNN, ANFIS, Microstrip Patch Antenna, UWB, CAD